Liquid-fuel burner



Feb. 10, 1931. c. F. LAMBERT LIQUID FUEL BURNER Filed July l1. 1925 l INVENTOR. OM eLfJ /T//ff/er WP) @wzl/ca ATTORNEY Patented Feb. 10, 1931 UNITED vSTATES PATENT OFFICE CHARLES E. LAMBERT, 0.7? GROSSE POINTE7 MICHIGAN, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO CLAYTON & LAMBERT MANUFACTURING CO., OF DETROIT, MICHIGAN,

A CORPORATION OF DELAWARE LIQUID-FUEL BURNER Application led July 11,

This invention relates to liquid fuel burners and has to do more particularly with foldable stoves of the liquid fuel type having a plurality of burners, and the method of operating the same.

The majority of portable or folding stoves,

of the liquid fuel burner type, have heretofore been more or less inefficient as to the constant quality of the combustible mixture and the Vburner structure and an entirely novel method of generating and conducting gaseous fuel to the burner or burners whereby all parts of the manifold are kept clean by con-V stant drainage so that each burner provides at the initial starting thereof, and at all times, a blue and perfectly combustible flame. More specifically, the present invention contemplates the provision of a compact, novel fuel manifold having two or more burners in direct connection therewith, one ofthe burners being constantly lighted during the loperation of the unit and the other burner or burners and manifold adjacent thereto being drained by a novel pilot light so positioned relative to the burner, and in combination therewith, as to effectively drain the manifold while the burner is shut off, andato also prevent excess pressure within the burner when the valve therefor is first opened.

Other features of the invention include the novel combination of the various parts and the compact unitary design therefor, as is more clearly set forth in the specification and claims.

In the drawings: Fig. 1 is a longitudinal sectional view taken through a burner structure of the liquid fuel type, embodying the features of the present invention.

Fig. 2 is a plan view of the directly con-A trollable burner element and illustrating the manner of positioning the pilot burner rela- 1928. Serial No. 291,737.

tive thereto to effect constant drainage of the manifold.

Fig. 3 is a fragmentary enlarged detail view of the novel ,pilot burner element.

In illustrating the present'invention I` have shown the same as being embodied in a stove structure of the liquid fuel foldable type inasmuch as the present invention s directly associated with burner structure utilizing .liquid fuel and having means for Vvaporizing the same. i

The stove casing may be generally designated 1 and preferably is of the foldable type having a foldable end wall 2 adapted to be moved to the position shown for receiving and supporting the fuel tank 3 of a movable fuel supply unit which includes such tank and a generator tube 4. The fuel supply unit is adapted to be slidably supported by the end wall 2 but the generator tube is guided by and cooperates with a. suitable mixing chamber 5. The normal operating position of the generator tube is that illustrated in Fig. 1 wherein the jet block or head thereof is positioned adjacent'thefentrance of the mixing `chamber Y In starting position the generator tube4 is adapted -to be moved longitudinally through the mixing chamber to first raise the valve member 6 and then assume a position, as shown in dotted lines at 7 adjacent the deflector and priming member 8. In this starting position the gas initially issuing from the generator tube in the form of fuel vapor will be deflected back against the tube in the form of a blast of flame to accelerate the starting thereof;

When the valve member 6 is closed it completes the mixing chamber housing,` and in this case the vaporized fuel is conducted away from the mixing chamber through the manifold 9, the mixed combustible gases being conducted in one direction through a manifold 10 towards the burner 11 and in the other direction through a manifold 12 to a burner member 13.

The burner 11 is positioned in partbeneath the enlarged portion 14 of the generator tube whereby to heat the same and effect vaporization of the liquid fuel, The mixing chamber is so designed as to admit the proper amount of air to form a combustible mixture which is to be conducted as such to the burners. The burner 11 being in direct communication with 5, the manifold 9 it will be obvious that such correctly mixed fuel vapor will be constantly issuing from the burner and will burn with a blue flame. The other burner 13 is provided with a suitable valve 15 adapted to be operated by a rod 16 whereby when it is only desired to have the main burner 11 operating, this burner 13 may be completely shut olf'.

The burner 13 preferably comprises a central head which may be designated 17 and which is positioned directly above the valve 15'. A plurality of radially extending circumferentially spaced burner elements 18 extend from said head 17 and in a plane below said head whereby said head forms a cushioning chamber above the plane of the burner elements.

A pilot burner 2O is positioned on the manifold 12 and the legs 18 of the burner 13 are so.arranged,'as best shown in Fig. 2 whereby this pilot burner may be positioned directly adjacent the central head 17 of the burner 13. The pilot burner 20 is of such design and such size as to maintain a constant pilotrlight at the position shown during the operation of the generating apparatus of the burner, and it will be obvious that during the operation of this burner structure that the manifold 12 will be drained by said pilot burner 2O whereby when the valve 15 is opened a substantially fresh supplyV of correctly mixed f uel vapor will be supplied to the burner 13 to immediately present a blue non-smoking flame.`

The only possible dead end present in Vsuch an arrangement would be the smallV amount of gas or fuel vapors trapped in the valve 15, and this small amount of fuel vapor will be conducted first to the cushioning chamber 17 andv therefore serve as a cushioning means for cushioning the oncoming fuel vapor before the same is supplied to the burner element-s. It will therefore be seen that this smallv amount of fuel vaporr trappedv in the valve 15 will be utilized in starting the burner and thus serve as a useful function rather than a detriment.

The cushioning of the fuel vapor in the chamber 1'?" will cause an even flow of fuel vapor radially outward in each burner element whereby when the valve 15 is opened the fuel vaporv will be so evenly supplied to each part of each burner element that all of the burner elements will be instantly ignited, the fiame propagation from the pilot-burner 2O around the burner elements being almost instantaneous, which i-s in direct contrast to other burner structures `where the gas is forcedvl outwardly to the ends of the burner elements or tubes and thus prevents quick propagation of the flame around the burner.

The pilot burner 2O preferably consists of a simple tube extending upwardly from the manifold 12 and recessed as at 21, whereby to receive and position a suitable perforate burner element 22 which is positioned at a predetermined distance from the top of the tube, the supply of fuel vapor being correctly mixed when it enters the pilot tube. A constant, permanent flame will be present in the pilot tube above the screen 22 at all times during the operation of the burner structure.

It will be obvious that this novel burner structure is very compact and simple in form and that in the preferred form a large portion of the mixing chamber together with the manifolds and a portion of the burner structures are all formed as a single integral unit or casting. l l

What I claim is: Y

1. Stove structure of the liquid fuel type, comprising a mixing chamber, a generating tube fer supplying vaporized fuel to said chamber,v a burner positioned beneath said generating tube and in open communication with said `mixing chamber. for constantly heating said generating tube, a manifold leading from said mixing chamber and terminating in a second burner means for shutting o5 said second burner adjacent the connection between said manifold and burner, and a pilot tube leading from said manifold and positioned closely adjacent said means for shutting oi the burner.

2. A stove structure of the liquid fuel type comprising a slidable generator tube adapted to cooperate' with a mixing chamber, a

lll)

conduit leading from said mixing chamberVV for supplying combustible fuelV vapor to a burner positioned vin heating relation with said generating tube, a second' conduit' leading from said mixing chamber to a valve controlled burner, and a pilot tube projecting upwardly in lighting relation with said burner and positioned closely adjacent said burner and said valve member whereby to drain said conduit.'

3. Stove construction comprising liquid fuel` generating and burner structure of the two burner type, comprising a mixing chamberfor receiving vapori'zed fuel and' mixing the same, a contiguous conduit directly connected to said mixing chamber and extending in two directions therefrom towards said Ytwo burners, a valve in one of saidv conduits for controlling the supply of'vap'orized fuel in one of said burners, and a pilot tube posiltioned adjacent said valveA for constantly draining said' conduit.

ll. Stove construction comprisingv liquid fuel' generatingv and burner apparatus ofthe two burner type, a mixing chamber for receiving and mixing vaporized liquid fuel, said two burners being positioned in longitudinal alignment with said mixing cham- IlO ber, a single manifold conduit extending between said two burners and connected at a point intermediate of said burner with said mixing chamber, a valve positioned at one end of said conduit and directly below one of said burners, and a pilot burner positioned closely adjacent said valve and burner for constantly draining said conduit.

5. Stove construction comprising liquid fuel generating and burner apparatus, a mixing chamber for receiving and mixing vaporized liquid fuel, a conduit extending between said burners Vand connected with said mixing chamber, a. valve positioned at one end of said conduit and directly below one of said burners, and a pilot burner positioned closely adjacent said valve and burner for constantly draining said conduit, said burner being provided with an auxiliary chamber positioned above the plane of the burner itself, and having a capacity substantially equal to the capacity of said valve whereby when said valve -is opened the fuel vapor in said valve will first collect in said auxiliary chamber whereby to cushion the positioned adjacent the burner ofr connecting said conduit with said burner, said valve having a capacity substantially equal to the capacity of .said auxiliary chamber, anda pilot burner positioned in said conduit adjacent said valve `at one end and adjacent said burner at the other end whereby to constantly drain said conduit up to said valve.

In testimony whereof I afix my signature.

' CHARLES F. LAMBERT.-

from, and a pilot tube positioned closely adjacent said valve and housing and extending upwardly between two of said burner elements whereby to serve as a pilot burner for said burner and also as a drainage means f for said conduit.

7. Stove structure of the liquid fuel type comprising generating means, a mixing chamber, a manifold conduit leading from the mixing chamber -and adapted to supply the burner with fuel vapor, said burner consisting of an upstanding central head having burner elements projecting radially therefrom and in a plane below the top of said head whereby said head forms a cushioning chamber above the plane of the burner elements, means for shutting off the supply of fuel vapor to said burner, and a pilot burner consisting of a hollow tube and a perforate burner element positioned within the tube at va distance from the end thereof, said pilot burner being positioned in said. conduit and adjacent said burner head whereby to supply a pilot flame and also drain said conduit.

8. Stove structure of the liquid fuel type, comprising generating means, a mixing chamber, a manifold adapted to supply the fuel vapor to a burner, said burner having .an auxiliary chamber positioned above the plane of the burner itself, a valve directly 

